In 2007, a toy theory was introduced [1]}
capable of reproducing a number of important quantum features such
as the existence of non-commuting observables, the impossibility of
cloning arbitrary states and the presence of entanglement, while simultaneously
admitting a description in terms of local hidden variables. Originally,
Spekkens' model had been introduced without reference to the GPT framework.
Here, we will consider its reformulation as a GPT, as described in
[2]}.
